[clutter] conform/cogl-materials: Fix a compiler warning

[Emmanuele Bassi <ebassi src gnome org>]

commit dcad27120ed8387ade8791bee3dbb4bebe43fa97
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Mon Jul 25 11:07:18 2011 +0100

    conform/cogl-materials: Fix a compiler warning
    
    The function checking for the presence and use of the GLES2 support in
    Cogl should be protected by #ifdef guards, to avoid a compiler warning.

 tests/conform/test-cogl-materials.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/tests/conform/test-cogl-materials.c b/tests/conform/test-cogl-materials.c
index 5c74df5..0abf564 100644
--- a/tests/conform/test-cogl-materials.c
+++ b/tests/conform/test-cogl-materials.c
@@ -128,6 +128,7 @@ test_invalid_texture_layers (TestState *state, int x, int y)
   test_material_with_primitives (state, x, y, 0xffffffff);
 }
 
+#ifdef COGL_HAS_GLES2
 static gboolean
 using_gles2_driver (void)
 {
@@ -136,6 +137,7 @@ using_gles2_driver (void)
   return g_str_has_prefix ((const char *) gl_functions.glGetString (GL_VERSION),
                            "OpenGL ES 2");
 }
+#endif
 
 static void
 test_using_all_layers (TestState *state, int x, int y)